New azo dye



Patented Sept. 3, 1929'.

UNITED STATES PATENT OFFICE.

ALBERT SOHMELZER AND FRIEDRICH. MUTE, OF ELBERFELD, AND EUGEN GLIETEN- BERG, OF LEVERKUSEN-ON-THE-RHINE, GERMANY, ASSIGNORS' TO GENERAL ANI- LINE WORKS, INC., OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

NEW AZO DYE.

-No Drawing. Application filed December 20, 1927, Serial No. 241,452, and 'in Germany December 22,1926.

The present invention relates to new and valuable azo dyestuffs which are obtainable by coupling a diazotized amino-carbazole compond with a 2.3-hydroxy-naphthoic acid 5 arylide and which correspond to the general formula:

N :NR

By reduction with zinc and hydrochloric 25. acid 1-amino-2-hydroxy-3-naphthoic acidarylide and an amino-carbazole are obtained.

The coupling process may be carried out on a substance or on fibre.

The following examples serve to illustrate 3 our invention Example 1.Cotton yarn, which has been One can use other diazotized amino-carbazo1es,e. g..such derived from 2-, 3- or it-aminocarbazoles or other arylides of the 2-hydroxy- 3-naphthoic acid e. g. the alphaor beta-naphthylamide, para-phenetidide, para-anisidide etc.

boiled out and dried, is impregnated with a solution containing 8 grams of 2.3-hydroxynaphthoic acid-ortho-toluidide, com. of caustic soda lye of 34 B., and ccm. of Turkey red oil per liter; after removing the excess of the impregnating solution development takes place by immersing Without drying in a diazo solution, (the mineral acid of which has been neutralized by sodium acetate), which contains 2 grams of l-aminocarbazole m. p. 195196 0. per liter, the goods are then rinsed and soaped. Very beautiful red violet shades of good fastness to light are thus obtained. The dyestufi' has the following formula:

|N=N III on coma-Q v H,

Ewample' 2.By employing di-2.3-hydroxynaphthoic acid dianisidide and 2-amino-3.6-dichlorocarbazo1e red violet shades are obtained, likewise possessing satisfactory on no i CO-NHQQNH-OO 4 HI Ha We claim: 1. Process for the manufacture of azo dyestuflis, which are insoluble in water, by coupling a diazo compound of an unsulfonated monoamino carbazole compound with an 2. Asrnew products azo dyestufl's of the general formula:

CO'NH-Ih in which R stands for a carbazole residue which may be substituted and R for an aryl residue which may be substituted, which products are in a,free and dry state generally dark powders soluble in concentrated sulfuric acid with a yellowish brown coloration, dyeing when produced on the fibre clear violet shades of excellent fastness to chlorine, light and boiling and yielding upon reduction with zinc and hydrochloric acid an l-amino-EZ-hydroxy-3-naphthoic acid arylide and an aminocarbazole.

3. As new products azo dyestuffs of the general formula:

III=N R I on CO-NH-R] in which R is a carbazole residue'which may ,be substituted, R, a benzene residue which may be substituted, which products are in a free and dry state generally dark powders soluble inconcentrated sulfuric acid with a yellowish brown coloration, dyeing when produced on the fibre clear violet shades of excellent fastness to chlorine, light and boiling,

and yielding upop reduction with zinc and hydrochloric acid an 1-amino-2-hydroxy-3- naphthoic acid naphthalide and an aminocarbazole. r

v 4. As a new product the azo dyestufi of the formula i 1. F O

O ONH which is in a dry and free state a dark powder 6. As new products, fibres dyed with a dyestuff claimed in claim 3.

7. As new products, fibres dyed with the dyestufi claimed in claim 4.

In testimony whereof we have hereunto set our hands.

ALBERT SCHMELZER.

FRIEDRICH MUTH. EUGEN GLIETENBERG. 

